In 2006 Newsweek thought George W Bush's use of the word Caliphate was humorous

' When Ahmed heard "caliphate" Wednesday morning, he thought of the way Bush used the word "crusade" after September 11. "There's a fundamental misunderstanding with the president and his advisers on core Islamic issues," Ahmed said. "He's getting bad advice, they're misinformed on Islamic terminology." Either that, or he's making a strategic rhetorical choice.'

More here http://www.newsweek.com/bushs-new-word-caliphate-111461